Phobos and Deimos in the sky of Mars

Digital work

Phobos moves very quickly in the sky of Mars. From its dawn in the west to its setting in the east, the satellite crosses the Martian sky in only 4 hours and 15 minutes. The angular size is about 0.20 °, one-third the size of the Moon in our sky. Deimos is visible with a size of 2.5 arcminutes, similar to Venus seen from Earth.